Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76fc3ed0d384b47…

MALICIOUS

PDF

117.5 KB Created: 2021-07-16 09:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 452e4c790a4cc93143951f6ba0a15c38 SHA-1: a6f13651b7010cd01db36d366415d6f1bb9c9cf2 SHA-256: e76fc3ed0d384b47e7b82e6708a3a2dff02dc32664de620e76a630ba4eb91766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress uploads and disposable hosting sites. These links likely serve to obscure the ultimate destination and distribute further malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=qibla+is+which+side PDF link annotation
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3od5a2vdu0uoo0r8qvd90vqcaf/88579771721.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/53932627376.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/vizanutotugil.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b180499097dd456c1e03379d942b0831/jakimukavewabaxapavewutox.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541107da93---23215771462.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/247db7d7c15b61be2cc60921d65a7dcc/lozejiluzixatojetowatevuz.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/fefifunoruviveri.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210615150843153.pdfIn PDF document text
    • https://masihpt1.com/contents//files/19725960492.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/64939541323.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90beb08ed4---70240126978.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/75707631688.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/88uvdh971thgb40n2s0s59lhq1/lasubibadixegozawuza.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b64164633---tewigoxabejuzix.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/wakalelafemasutefiru.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/paribipujawomajivipases.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/gepesara.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b352a439c---raxovogefaguzebum.pdfIn PDF document text
    • http://canadanur.com/resimler/files/pevemu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160911b533ee18---40461035223.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c4f24810ba6591bf71d55e2e599e5176/19439465270.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0ac8946c5fea2fa7bc7d06804b125eab/wapisikuvijumogezisutaz.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fenodaxibizilutomepoliso.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001ab3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AB3C 17908 bytes
SHA-256: 1f351311d3db9ac013accc8c9887ef1defb89f0c66014b2547a64812eb7667ee
font_00_sfnt_off00014a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16217 10328 bytes
SHA-256: 3a5d298a0c88e5a19cc0370f313f973b417313314b2b4b1b5fe93aef638dde3b
font_02_sfnt_off000179a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A8 19240 bytes
SHA-256: ef1be6b60ac53bc1e36e7ad12f16e97942ea6891d38c3a87e71418b245dcfca1

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